Improvement in saw-swage



blow of the hammer.

waited 095mm ,anni

Jos-EPH spcLARK, or NEW-Yoann. Y.

Letters Patent No. 97,7613, dated December 14, 1869.

IMPROVEMENT IN SAW-SWAG-E.

The Schedule referred to in th'ese Letters Patent and making part of the name.

To all whom-tt may concern: p

13e it known that I, JOSEPH S. CLARK, of the city and State of New York, have invented a new and improved Mode of Constructing Swages for Spreadingv and Sharpening Saw-Teeth; andI do hereby declare that the followiu g is a full, clear,` and'exact description of the construction and operation of the same, reference heilig had to the annexed drawings, making a part of this specification, in whichligure 1 is a side sectionalview of a swage placed upon a saw-tooth, and standing at the proper angle to receive' the force of a hammer, and thereby spread the edge ofthe tooth.' g p j,

Figure 2,a side 'view of a s'wage complete. Figure 3, a side sectional view, showing how the tongue c may be formed, by sawingtwo cuts atan angle with the `stock a'.

` `Figure 4, a view ofthe saine after the jaws b and e l have been forged down on to the tongue.

Letters f f, the two planes oft-ne tongue. f

Letter h, part of the sawfplate. Y

Letters t t', dotted line, showing the direction of the Letters jj, the cuts on each side ofthe tongue.l

l'lofeonstruct a swage, I first forge a piece of caststeelfor-the stock a' into the s ize andform shown on thevv drawings, mill out a central cavity for the tongue e, the lin-e of the two sidesbeing at an angle with Vthat ofthe centre of the stock; then nish the ends of the i two'i'jaws b and e ou a bevel, making b straight, and e a little round or convex on the face. The tongue is next formed, as shown at c, g.1and fitted accurately into the jaws l1 and e.

The collar d is made of iron, perfectly fitted to the jaws, and driven on tight after the ends of the jaws and the tongue have been hardened and tempered.

On examination of tig. 1,-. it will be observed that the shank a is elevated at an obtuse angle to the line of the top of the tooth. This elevated position is necessary' in order that the force of the blow, 4when applied to the end of the shank, will be in the direction of the best supported portion ofthe tooth.

If the line of the shank were placed parallel with that of" the top of the `tooth,the end of the tooth would jump up at each blow of the hammer.

The position of the swage as described is common tofall swages in use. This position is unavoidable; hence, it will be observed, .that in order' to have theY angles ofthe two jaws b e intersect the planes f f, the

tongue c should be made in form as sliivmiiistead of the lines f f being made parallel with thatof the shank.- j

The object in making the tongue c separate from the shank is for the purpose that it may be taken out,

and thus admit the jaws b and e to be ground and repaired when necessary.

I am aware that a removable die 4has been used in a saw-set, as seen in the patent f N. F. Stone, dated April 17, 1866; I do not, therefore, claim broadly a removable die in a saw-swage.

My invention differsv materially from that of Stones, referred to. 4In my invention, the die c is not only replaceable when broken, but can be removed, for the purpose of` grinding the jaws b and e when inoperative.

What I claim asmy invention, and desi-re to secure i by Letters Patent, is-

lhe removable ydie c, in combination with the bev- 

